United Technologies Carrier WeatherMaker 50TC A08 Series, Installation Instructions Manual

Page: 53 / 80

53
Supply Air Temperature (SAT) Sensor —
On
FIOP-equipped 50TC unit, the unit is supplied with a supply-
air temperature (SAT) sensor (33ZCSENSAT). This sensor is a
tubular probe type, approx 6-inches (152 mm) in length. It is a
nominal 10k ohm thermistor.
The SAT is factory-wired. The SAT probe is wire-tied to the
supply-air opening (on the horizontal opening end) in its ship-
ping position. Remove the sensor for installation. Re-position
the sensor in the flange of the supply-air opening or in the sup-
ply air duct (as required by local codes). Drill or punch a 1 /
2
-in.
hole in the flange or duct. Use two field-supplied, self-drilling
screws to secure the sensor probe in a horizontal orientation.
See Fig. 76.
Fig. 76 — Typical Mounting Location for Supply
Air Temperature (SAT) Sensor on Small Rooftop
Units
NOTE: Refer PremierLink Controller Installation, Start-up,
and Configuration Instructions for complete PremierLink con-
troller configuration, operating sequences and troubleshooting
information. Have a copy of this manual available at unit start-
up.
NOTE: The sensor must be mounted in the discharge airstream
downstream of the cooling coil and any heating devices. Be
sure the probe tip does not come in contact with any of the
unit’s heater surfaces.
OUTDOOR AIR TEMPERATURE (OAT) SENSOR —
The OAT is factory-mounted in the EconoMi$er2 (FIOP or
accessory). It is a nominal 10k ohm thermistor attached to an
eyelet mounting ring.
ECONOMI$ER2 — The PremierLink controller is used with
EconoMi$er2 (option or accessory) for outdoor air manage-
ment. The damper position is controlled directly by the Pre-
mierLink controller; EconoMi$er2 has no internal logic device.
Outdoor air management functions can be enhanced with
field-installation of these accessory control devices:
Enthalpy control (outdoor air or differential sensors)
Space CO
2
sensor
Outdoor air CO
2
sensor
Refer to Table 18 for accessory part numbers.
FIELD CONNECTIONS — Field connections for accessory
sensor and input devices are made at the 16-pole terminal block
(TB1) located on the control box bottom shelf in front of the
PremierLink controller (See Fig. 74 and Fig. 75). Some input
devices also require a 24-vac signal source; connect at CTB
terminal R at “THERMOSTAT” connection strip for this signal
source. See connections figures on following pages for field
connection locations (and for continued connections at the Pre-
mierLink controller board inputs).
Tables 19 and 20 provide a summary of field connections
for units equipped with Space Sensor. Tables 21 and 22 provide
a summary of field connections for units equipped with Space
Thermostat.
Table 18 — PremierLink Controller Sensor Usage
NOTES:
CO
2
Sensors (Optional):
33ZCSENCO2 — Room sensor (adjustable). Aspirator box is required for duct mounting of the sensor.
33ZCASPCO2 — Aspirator box used for duct-mounted CO
2
room sensor.
33ZCT55CO2 — Space temperature and CO
2
room sensor with override.
33ZCT56CO2 — Space temperature and CO
2
room sensor with override and setpoint.
SUPPLY AIR RETURN AIR
SUPPLY AIR
TEMPERATURE
SENSOR
ROOF
CURB
APPLICATION
OUTDOOR AIR
TEMPERATURE
SENSOR
RETURN AIR
TEMPERATURE
SENSOR
OUTDOOR AIR
ENTHALPY SENSOR
RETURN AIR
ENTHALPY SENSOR
Differential Dry Bulb Temperature
with PremierLink (PremierLink
requires 4-20 mA Actuator)
Included —
CRTEMPSN001A00
Required —
33ZCT55SPT or
equivalent
— —
Single Enthalpy with PremierLink
(PremierLink requires 4-20mA
Actuator)
Included — Not Used —
Requires —
33CSENTHSW
—
Differential Enthalpy with
PremierLink (PremierLink requires
4-20mA Actuator)
Included — Not Used —
Requires —
33CSENTHSW
Requires —
33CSENTSEN